Sharpening block



FIG. 1 is a perspective view of a sharpening block embodying my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view.

The dashed lines in FIGS. 1, 2, 3, and 5-7 illustrate environment only and form no new part of the claimed design. 

The ornamental design for a sharpening block, as shown and described. 